I can't speak directly for the MSA series, but the DL series accept any disk. And in the case of the new Gen 8 servers any drive works as well, but it'll set off a warning that the drives are not HP Authentic but work fine. I talked to several engineers about this before going with all Intel DC-S3500 SSD's in our new machine. I'd assume MSA is the same,
Gen 8 have that new drive caddie that requires a custom firmware on the hard drives to control the lights on the caddie. So the lights are all sorts of funny, so you lose that ability too, before Gen 8 lights worked fine.